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A uniform chain of mass M and length L i...

A uniform chain of mass M and length L is hanging from edge of a rough horizontal table such that half of chain is on the table.The coefficient friction between the chain and horizontal surface is `mu` The minimum work to be done on chain to keep the chain completely on table is:

1) `(mgL)/(2)`

2) `(mgL)/(4)`

3) `(mgL)/(8)`

4) It depends on the value of `mu`

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